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(11)

EP 3 797 316 A1

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(43) Date of publication: 31.03.2021 Bulletin 2021/13 (21) Application number: 19749862.9 (22) Date of filing: 20.05.2019

(51) International Patent Classification (IPC):  G01S 17/08(2006.01) (86) International application number: PCT/US2019/033129 (87) International publication number: WO 2019/226552 (28.11.2019 Gazette 2019/48)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 21.05.2018 US 201862674430 P 17.05.2019 US 201916415202 (71) Applicant: Facebook Technologies, LLC. Menlo Park, CA 94025 (US)

(72) Inventors: HALL, Michael Menlo Park, CA 94025 (US) LIU, Xinqiao Menlo Park, CA 94025 (US) ZHU, Zhaoming Menlo Park, CA 94025 (US) CHHABRIA, Rajesh, Lachhmandas Menlo Park, CA 94025 (US) TANG, Huixuan Menlo Park, CA 94025 (US) SU, Shuochen Menlo Park, CA 94025 (US) GAO, Zihe Menlo Park, CA 94025 (US) (74) Representative: Murgitroyd & Company  Murgitroyd House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)